feat: add copy as text or markdown feature for assistant messages

If the message is a code command or file editor view, the copy icon won't
be shown. For other assistant messages, the copy icon will be shown.

src/components/chat/view/subcomponents/MessageComponent.tsx

@@ -1,4 +1,4 @@
-import React, { memo, useMemo } from 'react';
+import { memo, useEffect, useMemo, useRef, useState } from 'react';
 import { useTranslation } from 'react-i18next';
 import SessionProviderLogo from '../../../llm-logo-provider/SessionProviderLogo';
 import type {
@@ -9,10 +9,10 @@ import type {
 } from '../../types/types';
 import { formatUsageLimitText } from '../../utils/chatFormatting';
 import { getClaudePermissionSuggestion } from '../../utils/chatPermissions';
-import { copyTextToClipboard } from '../../../../utils/clipboard';
 import type { Project } from '../../../../types/app';
 import { ToolRenderer, shouldHideToolResult } from '../../tools';
 import { Markdown } from './Markdown';
+import MessageCopyControl from './MessageCopyControl';
 
 type DiffLine = {
   type: string;
@@ -20,7 +20,7 @@ type DiffLine = {
   lineNum: number;
 };
 
-interface MessageComponentProps {
+type MessageComponentProps = {
   message: ChatMessage;
   prevMessage: ChatMessage | null;
   createDiff: (oldStr: string, newStr: string) => DiffLine[];
@@ -32,7 +32,7 @@ interface MessageComponentProps {
   showThinking?: boolean;
   selectedProject?: Project | null;
   provider: Provider | string;
-}
+};
 
 type InteractiveOption = {
   number: string;
@@ -41,6 +41,7 @@ type InteractiveOption = {
 };
 
 type PermissionGrantState = 'idle' | 'granted' | 'error';
+const COPY_HIDDEN_TOOL_NAMES = new Set(['Bash', 'Edit', 'Write', 'ApplyPatch']);
 
 const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, onShowSettings, onGrantToolPermission, autoExpandTools, showRawParameters, showThinking, selectedProject, provider }: MessageComponentProps) => {
   const { t } = useTranslation('chat');
@@ -49,18 +50,32 @@ const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, o
       (prevMessage.type === 'user') ||
       (prevMessage.type === 'tool') ||
       (prevMessage.type === 'error'));
-  const messageRef = React.useRef<HTMLDivElement | null>(null);
-  const [isExpanded, setIsExpanded] = React.useState(false);
+  const messageRef = useRef<HTMLDivElement | null>(null);
+  const [isExpanded, setIsExpanded] = useState(false);
   const permissionSuggestion = getClaudePermissionSuggestion(message, provider);
-  const [permissionGrantState, setPermissionGrantState] = React.useState<PermissionGrantState>('idle');
-  const [messageCopied, setMessageCopied] = React.useState(false);
+  const [permissionGrantState, setPermissionGrantState] = useState<PermissionGrantState>('idle');
+  const userCopyContent = String(message.content || '');
+  const formattedMessageContent = useMemo(
+    () => formatUsageLimitText(String(message.content || '')),
+    [message.content]
+  );
+  const assistantCopyContent = message.isToolUse
+    ? String(message.displayText || message.content || '')
+    : formattedMessageContent;
+  const isCommandOrFileEditToolResponse = Boolean(
+    message.isToolUse && COPY_HIDDEN_TOOL_NAMES.has(String(message.toolName || ''))
+  );
+  const shouldShowUserCopyControl = message.type === 'user' && userCopyContent.trim().length > 0;
+  const shouldShowAssistantCopyControl = message.type === 'assistant' &&
+    assistantCopyContent.trim().length > 0 &&
+    !isCommandOrFileEditToolResponse;
 
 
-  React.useEffect(() => {
+  useEffect(() => {
     setPermissionGrantState('idle');
   }, [permissionSuggestion?.entry, message.toolId]);
 
-  React.useEffect(() => {
+  useEffect(() => {
     const node = messageRef.current;
     if (!autoExpandTools || !node || !message.isToolUse) return;
 
@@ -120,43 +135,9 @@ const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, o
               </div>
             )}
             <div className="mt-1 flex items-center justify-end gap-1 text-xs text-blue-100">
-              <button
-                type="button"
-                onClick={() => {
-                  const text = String(message.content || '');
-                  if (!text) return;
-
-                  copyTextToClipboard(text).then((success) => {
-                    if (!success) return;
-                    setMessageCopied(true);
-                  });
-                }}
-                title={messageCopied ? t('copyMessage.copied') : t('copyMessage.copy')}
-                aria-label={messageCopied ? t('copyMessage.copied') : t('copyMessage.copy')}
-              >
-                {messageCopied ? (
-                  <svg className="h-3.5 w-3.5" viewBox="0 0 20 20" fill="currentColor">
-                    <path
-                      fillRule="evenodd"
-                      d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z"
-                      clipRule="evenodd"
-                    />
-                  </svg>
-                ) : (
-                  <svg
-                    className="h-3.5 w-3.5"
-                    viewBox="0 0 24 24"
-                    fill="none"
-                    stroke="currentColor"
-                    strokeWidth="2"
-                    strokeLinecap="round"
-                    strokeLinejoin="round"
-                  >
-                    <rect x="9" y="9" width="13" height="13" rx="2" ry="2"></rect>
-                    <path d="M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1"></path>
-                  </svg>
-                )}
-              </button>
+              {shouldShowUserCopyControl && (
+                <MessageCopyControl content={userCopyContent} messageType="user" />
+              )}
               <span>{formattedTime}</span>
             </div>
           </div>
@@ -430,7 +411,7 @@ const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, o
                 )}
 
                 {(() => {
-                  const content = formatUsageLimitText(String(message.content || ''));
+                  const content = formattedMessageContent;
 
                   // Detect if content is pure JSON (starts with { or [)
                   const trimmedContent = content.trim();
@@ -476,9 +457,12 @@ const MessageComponent = memo(({ message, prevMessage, createDiff, onFileOpen, o
               </div>
             )}
 
-            {!isGrouped && (
-              <div className="mt-1 text-[11px] text-gray-400 dark:text-gray-500">
-                {formattedTime}
+            {(shouldShowAssistantCopyControl || !isGrouped) && (
+              <div className="mt-1 flex w-full items-center gap-2 text-[11px] text-gray-400 dark:text-gray-500">
+                {shouldShowAssistantCopyControl && (
+                  <MessageCopyControl content={assistantCopyContent} messageType="assistant" />
+                )}
+                {!isGrouped && <span>{formattedTime}</span>}
               </div>
             )}
           </div>

src/components/chat/view/subcomponents/MessageCopyControl.tsx

@@ -0,0 +1,209 @@
+import { useEffect, useMemo, useRef, useState } from 'react';
+import { useTranslation } from 'react-i18next';
+import { copyTextToClipboard } from '../../../../utils/clipboard';
+
+const COPY_SUCCESS_TIMEOUT_MS = 2000;
+
+type CopyFormat = 'text' | 'markdown';
+
+type CopyFormatOption = {
+  format: CopyFormat;
+  label: string;
+};
+
+// Converts markdown into readable plain text for "Copy as text".
+const convertMarkdownToPlainText = (markdown: string): string => {
+  let plainText = markdown.replace(/\r\n/g, '\n');
+  plainText = plainText.replace(/```[\w-]*\n([\s\S]*?)```/g, '$1');
+  plainText = plainText.replace(/`([^`]+)`/g, '$1');
+  plainText = plainText.replace(/!\[([^\]]*)\]\(([^)]+)\)/g, '$1');
+  plainText = plainText.replace(/\[([^\]]+)\]\(([^)]+)\)/g, '$1');
+  plainText = plainText.replace(/^>\s?/gm, '');
+  plainText = plainText.replace(/^#{1,6}\s+/gm, '');
+  plainText = plainText.replace(/^[-*+]\s+/gm, '');
+  plainText = plainText.replace(/^\d+\.\s+/gm, '');
+  plainText = plainText.replace(/(\*\*|__)(.*?)\1/g, '$2');
+  plainText = plainText.replace(/(\*|_)(.*?)\1/g, '$2');
+  plainText = plainText.replace(/~~(.*?)~~/g, '$1');
+  plainText = plainText.replace(/<\/?[^>]+(>|$)/g, '');
+  plainText = plainText.replace(/\n{3,}/g, '\n\n');
+  return plainText.trim();
+};
+
+const MessageCopyControl = ({
+  content,
+  messageType,
+}: {
+  content: string;
+  messageType: 'user' | 'assistant';
+}) => {
+  const { t } = useTranslation('chat');
+  const canSelectCopyFormat = messageType === 'assistant';
+  const defaultFormat: CopyFormat = canSelectCopyFormat ? 'markdown' : 'text';
+  const [selectedFormat, setSelectedFormat] = useState<CopyFormat>(defaultFormat);
+  const [copied, setCopied] = useState(false);
+  const [isDropdownOpen, setIsDropdownOpen] = useState(false);
+  const dropdownRef = useRef<HTMLDivElement | null>(null);
+  const copyFeedbackTimerRef = useRef<ReturnType<typeof setTimeout> | null>(null);
+
+  const copyFormatOptions: CopyFormatOption[] = useMemo(
+    () => [
+      {
+        format: 'markdown',
+        label: t('copyMessage.copyAsMarkdown', { defaultValue: 'Copy as markdown' }),
+      },
+      {
+        format: 'text',
+        label: t('copyMessage.copyAsText', { defaultValue: 'Copy as text' }),
+      },
+    ],
+    [t]
+  );
+
+  const selectedFormatTag = selectedFormat === 'markdown'
+    ? t('copyMessage.markdownShort', { defaultValue: 'MD' })
+    : t('copyMessage.textShort', { defaultValue: 'TXT' });
+
+  const copyPayload = useMemo(() => {
+    if (selectedFormat === 'markdown') {
+      return content;
+    }
+    return convertMarkdownToPlainText(content);
+  }, [content, selectedFormat]);
+
+  useEffect(() => {
+    setSelectedFormat(defaultFormat);
+    setIsDropdownOpen(false);
+  }, [defaultFormat]);
+
+  useEffect(() => {
+    // Close the dropdown when clicking anywhere outside this control.
+    const closeOnOutsideClick = (event: MouseEvent) => {
+      if (!isDropdownOpen) return;
+      const target = event.target as Node;
+      if (dropdownRef.current && !dropdownRef.current.contains(target)) {
+        setIsDropdownOpen(false);
+      }
+    };
+
+    window.addEventListener('mousedown', closeOnOutsideClick);
+    return () => {
+      window.removeEventListener('mousedown', closeOnOutsideClick);
+    };
+  }, [isDropdownOpen]);
+
+  useEffect(() => {
+    return () => {
+      if (copyFeedbackTimerRef.current) {
+        clearTimeout(copyFeedbackTimerRef.current);
+      }
+    };
+  }, []);
+
+  const handleCopyClick = async () => {
+    if (!copyPayload.trim()) return;
+    const didCopy = await copyTextToClipboard(copyPayload);
+    if (!didCopy) return;
+
+    setCopied(true);
+    if (copyFeedbackTimerRef.current) {
+      clearTimeout(copyFeedbackTimerRef.current);
+    }
+    copyFeedbackTimerRef.current = setTimeout(() => {
+      setCopied(false);
+    }, COPY_SUCCESS_TIMEOUT_MS);
+  };
+
+  const handleFormatChange = (format: CopyFormat) => {
+    setSelectedFormat(format);
+    setIsDropdownOpen(false);
+  };
+
+  const toneClass = messageType === 'user'
+    ? 'text-blue-100 hover:text-white'
+    : 'text-gray-400 hover:text-gray-600 dark:text-gray-500 dark:hover:text-gray-300';
+  const copyTitle = copied ? t('copyMessage.copied') : t('copyMessage.copy');
+  const rootClassName = canSelectCopyFormat
+    ? 'relative flex min-w-0 flex-1 items-center gap-0.5 sm:min-w-max sm:flex-none sm:w-auto'
+    : 'relative flex items-center gap-0.5';
+
+  return (
+    <div ref={dropdownRef} className={rootClassName}>
+      <button
+        type="button"
+        onClick={handleCopyClick}
+        title={copyTitle}
+        aria-label={copyTitle}
+        className={`inline-flex items-center gap-1 rounded px-1 py-0.5 transition-colors ${toneClass}`}
+      >
+        {copied ? (
+          <svg className="h-3.5 w-3.5" viewBox="0 0 20 20" fill="currentColor">
+            <path
+              fillRule="evenodd"
+              d="M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z"
+              clipRule="evenodd"
+            />
+          </svg>
+        ) : (
+          <svg
+            className="h-3.5 w-3.5"
+            viewBox="0 0 24 24"
+            fill="none"
+            stroke="currentColor"
+            strokeWidth="2"
+            strokeLinecap="round"
+            strokeLinejoin="round"
+          >
+            <rect x="9" y="9" width="13" height="13" rx="2" ry="2" />
+            <path d="M5 15H4a2 2 0 01-2-2V4a2 2 0 012-2h9a2 2 0 012 2v1" />
+          </svg>
+        )}
+        <span className="text-[10px] font-semibold uppercase tracking-wide">{selectedFormatTag}</span>
+      </button>
+
+      {canSelectCopyFormat && (
+        <>
+          <button
+            type="button"
+            onClick={() => setIsDropdownOpen((prev) => !prev)}
+            className={`rounded px-1 py-0.5 transition-colors ${toneClass}`}
+            aria-label={t('copyMessage.selectFormat', { defaultValue: 'Select copy format' })}
+            title={t('copyMessage.selectFormat', { defaultValue: 'Select copy format' })}
+          >
+            <svg
+              className={`h-3 w-3 transition-transform ${isDropdownOpen ? 'rotate-180' : ''}`}
+              fill="none"
+              stroke="currentColor"
+              viewBox="0 0 24 24"
+            >
+              <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M19 9l-7 7-7-7" />
+            </svg>
+          </button>
+
+          {isDropdownOpen && (
+            <div className="absolute left-auto top-full z-30 mt-1 min-w-36 rounded-md border border-gray-200 bg-white p-1 shadow-lg dark:border-gray-700 dark:bg-gray-900">
+              {copyFormatOptions.map((option) => {
+                const isSelected = option.format === selectedFormat;
+                return (
+                  <button
+                    key={option.format}
+                    type="button"
+                    onClick={() => handleFormatChange(option.format)}
+                    className={`block w-full rounded px-2 py-1.5 text-left transition-colors ${isSelected
+                      ? 'bg-gray-100 text-gray-900 dark:bg-gray-800 dark:text-gray-100'
+                      : 'text-gray-700 hover:bg-gray-50 dark:text-gray-300 dark:hover:bg-gray-800/60'
+                      }`}
+                  >
+                    <span className="block text-xs font-medium">{option.label}</span>
+                  </button>
+                );
+              })}
+            </div>
+          )}
+        </>
+      )}
+    </div>
+  );
+};
+
+export default MessageCopyControl;